The best screen would be infinite pixels (wouldn't really be pixels obviously at that point, some other tech instead). Why is moving towards that goal a 'no thank you'.

PS: I think apple's engineers are maybe smart enough to figure out text size, seeing as they can apply the identical property that the Retina Display on their phones use. Also, there's no loss in graphics performance having a screen at that res, because you can just set your game to 1440x900 and you get an image that looks identical to a native 1440x900 15" screen. That's the beauty of pixel mapping. Viola!!